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Aspirator
A brass aspirator. The water inlet and outlet are at the top and bottom, respectively; the air inlet is on the side.
A vacuum ejector, or simply ejector is a type of vacuum pump, which produces vacuum by means of the Venturi effect.
In an ejector, a working fluid (liquid or gaseous) flows through a jet nozzle into a tube that first narrows and then expands in cross-sectional area. The fluid leaving the jet is flowing at a high velocity which due to Bernoulli's principle results in it having low pressure, thus generating a vacuum. The outer tube then narrows into a mixing section where the high velocity working fluid mixes with the fluid that is drawn in by the vacuum, imparting enough velocity for it to be ejected, the tube then typically expands in order to decrease the velocity of the ejected stream, allowing the pressure to smoothly increase to the external pressure.
The strength of the vacuum produced depends on the velocity and shape of the fluid jet and the shape of the constriction and mixing sections, but if a liquid is used as the working fluid the strength of the vacuum produced is limited by the vapor pressure of the liquid (for water, 3.2 kPa or 0.46 psi or 32 mbar at 25 °C or 77 °F). If a gas is used, however, this restriction does not exist.
If not considering the source of the working fluid, vacuum ejectors can be significantly more compact than a self-powered vacuum pump of the same capacity.
A vacuumejector, or simply ejector is a type of vacuum pump, which produces vacuum by means of the Venturi effect. In an ejector, a working fluid (liquid...
eductor-jet pump, a water eductor or an aspirator. An ejector operates on similar principles to create a vacuum feed connection for braking systems etc. The motive...
an air-tight plug; an ejector on the locomotive, to create vacuum in the train pipe; controls for the driver to bring the ejector into action, and to admit...
than the flow of process gas, allowing the scrubber to also act as a vacuumejector and draw process gas through the device without external assistance...
subjected to an internal vacuum (i.e., low pressure) that is lower than the equipment can withstand. In such cases, vacuum relief valves are used to...
A vacuum breaker is an attachment commonly placed on a bibcock valve or toilet or urinal flush valve, that prevents water from being siphoned backward...
for measuring the fluid flow and for moving other fluids (e.g. in a vacuumejector). In inviscid fluid dynamics, an incompressible fluid's velocity must...
steels, and forged steels. All-metal gate valves are used in ultra-high vacuum chambers to isolate regions of the chamber. Bonnets provide leakproof closure...
conveyed by vacuum sewer. Pipelines range in size from pipes of 125 millimetres (4.9 in) in diameter up to 280 millimetres (11 in) in diameter. Vacuum sewer...
Maintaining a vacuum in the condenser is an important aspect of the efficient operation of steam turbines. A steam jet ejector or liquid ring vacuum pump is...
down until the rubber cup is flattened, and is then pulled out, creating a vacuum to pull blockage material upward and dislodge waste or other material. The...
also be used in vacuum systems, when a precise control of gas flow is required, at low pressure, such as when filling gas-filled vacuum tubes, gas lasers...
sewerage Storm drain Sanitary sewers not relying solely on gravity include: Vacuum sewer Effluent sewer Where a sewerage system has not been installed, sewage...
then over. However, it has been demonstrated that siphons can operate in a vacuum and to heights exceeding the barometric height of the liquid. Consequently...
ejector pump can also be connected to a garden hose to supply high-pressure water, with another hose to carry the water away. Although such ejector pumps...
applications, including water supply, drainage, sewers, vents, central vacuum systems, compressed air and gas lines, heating and air conditioning, sump...
US$38 million. This was followed by the purchase of the Hick Hargreaves vacuumejector and deaerator units; Wilhelm Klein GmbH; Stokes piston pump operations...
pumps push fluid to the surface, rather than jet pumps, which create a vacuum and rely upon atmospheric pressure. Submersibles use pressurized fluid from...
buildings. Steam ejector refrigeration cycles were later supplanted by systems using mechanical compressors. Steam is passed through a vacuumejector of high efficiency...
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